Reverse transmigration bingqiu except instead of Bingge turning up in Shen Yuan's world, it's white lotus disciple Binghe who does.
Shen Yuan, currently in his last year of high school, finds him and thinks he's a troubled homeless kid who has latched onto a character from a web novel as an intense form of escapism. He's initially just going to hand him over to some authorities of some kind but the kid seems so lost and scared, instead he ends up deciding to personally use his family's connections to help him or at least find his actual family or something (of course, doesn't turn anything up).
Baby Binghe is brand new to Qing Jing peak in the timeline he left from, so he doesn't have any idea of cultivating. With his demon blood still locked, he's a normal kid. But he's smart! He figures out basic appliances and picks up other modern facilities pretty quickly, wins over SY's family, and eagerly decides to keep living with him when SY moves out for the first time. SY's almost feeling bad because he definitely got the better end of this deal. His family manages to enroll LBH in school and they get him a bunch of lessons on things he seems interested in, and even so this kid still finds time to do a better job cooking and cleaning than SY, whose schedule is less packed.
A couple years pass. SY is beginning to accept that this is a permanent situation. So is LBH, who is kind of sad that he won't be able to fulfill his mother's dream of him becoming a cultivator, but actually really likes living in the magic shiny future with Shen Yuan and wouldn't change it now even if he could. SY is looking at long-term things for organizing Luo Binghe's further education, travel, etc. He's come out of his shell, is more active in the world and with his family because he needs to make sure his young ward gets proper socialization! (SY's family think LBH is the best thing that ever happened to him, and don't point out that they're actually only a few years apart in age; except Shen Meimei, who is the same age as LBH.) Meanwhile Luo Binghe's life plan is veering towards "housewife" aspirations, but he's still too shy to mention that to the object of his crush. It's okay though, he's got time! He'll get older and then figure out how best to approach the situation! (And in the meanwhile run off anyone else who tries to date his future husband...)
Of course, that's when it turns out that the system sent him here as an emergency measure to get him out of the way while it resolved a major issue with the actual setting. When the issues are repaired, it yanks LBH back. He finds himself returned to the exact same moment he left, in the same physical state, the years he spent living with Shen Yuan seemingly erased.
Going back to Qing Jing Peak after all that is difficult. No, worse, it's almost completely intolerable. Luo Binghe has been treated right and had a good life and now it's just gone. He has no idea how to get back.
But, that's why he has to stay. Because if there is a way to get back, then his best shot at figuring it out is learning how to cultivate, and devouring every single book in Qing Jing Peak's library, and then every other sect's library if need be. It is possible to move between worlds! He knows, because he did it! He just needs to find the way to do it again, permanently. So he stays and he deals with Shen Qingqiu's cruelty and the bullying of his sect mates, but he doesn't hold out any hope for them to improve. Instead he tries his best to hold his own ground, uses things he learned from Shen Yuan's world to steal whatever advantages he can, and pushes his way through any obstacles or competition.
He hates Shen Qingqiu, though. Especially because he has the surname Shen. Shen Yuan's family was good to him, so it seems like a cruel joke of fate that his shizun is so dead set against him. Something that could have been a comfort is instead a bitter twist of the knife.
But then a couple of years into this, Shen Qingqiu... changes?
After suffering a qi deviation, he stops beating Luo Binghe at the slightest provocation. He stops beating any of his students, in fact. He gives Binghe medicine, actually starts teaching classes, rescues Luo Binghe from a malicious skin-stealing demon, takes the blow of an incurable poison to save him from another demon, even gives him the side room of his own house to stay in. The bullying ends and the atmosphere on Qing Jing Peak changes, like night and day. Somehow he goes from being Shen Qingqiu's most hated student to being his clear favorite, even doted on disciple.
Luo Binghe is not going to fall in love with this new reformed Shen Qingqiu, though. He isn't! His heart is not so fickle that he will just fall in love with anyone who is kind to him! His love for Shen Yuan, that was real. And Shen Yuan would tell him that even though Shen Qingqiu seems to have changed, Luo Binghe shouldn't just forget about the past, because what if Shen Qingqiu returns to that behavior? It might not happen, but if it does then Luo Binghe must react accordingly.
But it's difficult, sometimes. This new Shizun, he's... he's really... sometimes he seems just like...
But Luo Binghe won't fall in love with him!
No matter what, he won't stay. He has to figure out how to move between worlds, and get back to Shen Yuan. Who he REALLY loves. Not Shen Qingqiu. He is in love with Shen Yuan and he is not falling in love with Shen Qingqiu.
